Circuit-switch.



L. WILSON.

CIRCUIT SWITCH.

APPLICATION rum: rma, 1010.

970,410, Patented Sept. 13,1910.

UNITED strA rns a rENtr OFFICE:

LOYD WILSON, ,OF DE'IYROIT, MICHIGAN.

CIRCUIT-SXVITCH.

Specification of Letters Iatent.

Application filed February 3, 1910.

Patented Sept. 13, 1910.

Serial No. 541,917.

T 0 all whom it may concern:

Be it known that I, Lori) Wilson, who am a citizen of the United States, residing at Detroit, county of \Vaync, State of Michigan, have invented a certain new and'useful Improvement in CircuitSwitc-hes, and deimpossible for any one except the owner to possess an operative key to the motor ma-' chine, while the vehicle is at rest.

In the drawings :F1gure 1,1s a plan v ew of the body block of the device. Fig. 2, 1s a side elevation in section along the line aa of Fig. 1, showing the key in lace, and in contact with the circuit termina s. Fig.3, is a sectional elevation with the key removed but h'pwn adjacent thereto. Fig. 4, is a detail section showing one of several possible variations in the interior construction of the dev'ce. Fig. 5, is a section on the line b-b of Fig. 2.

1 represents the body block of the device, which may be of any desired material of non-conducting character. This may be mounted upon a frame or wall piece 2, which is ,sufliciently apertured to ermit the en trance froin the rear of the circuit terminals 3 and 4, andthe undisturbed presence of the leaf spring owhich'may constitute one of the terminals. The second terminal 6 is preferably brought to an 'end well withinthe body portion of the device, and adjacent a cutaway portion into which the key member 7,,after certain turnings and actuation known only to the owner of the device, is finally brought to a position of circuit closing. I

The key 7 is constructed with one or more wings 8 projecting laterally from the stem thereof in such position as to engage in the desired one of the radial cut-away portions 9 when the stem 7 is inserted in the central bore 10. The radial cut 9, in which the wing is first inserted, extends only a portion of the distance from the top or entrance side of the switch body toward the inner bottom end, at which point of ending the win" strikes a shoulder 11, which prevents its urther progress in that direction without being turned about the stem 7 as an axis through an arc of predetermined size, when it encounters another cut-away por tion extending from that level or plane in the body block the remainder of the distance to the bottom or inner face thereof. It a key with more than one wing is used, the two wings are preferably set at points on the stem 7 more or less removed from one another lengthwise of the stem so that the wing 8 must be inserted in the cut--away p0rtion 9, while the wing 12 must be inserted on the side through which the cut.away portion 13 projects, in order that these two wing portions may reach their pro )er and. intended levels at the same time as t ie stem.

7 is sunk in the body of the block, which then participates in the turning or swinging about the stem 7 as a center until the wing- 8 incloses its supplemental radial cut 14, and the wing 12 incloses its supplemental out 15, when they may be forced t roughthe remainder of the distance into contact with the terminal faces 5 and 6. In these )OSltions the key completes the closure 0 the circuit and the use of the device, but if the key were in another or strange arrangement of the wings when one wing reached its first opposite shoulder, the other, fixed as it is to the stem' of the key, would still be some distance therefrom and thus held in a position wherein turning would'be impossible. Similarly, it would be impossible to at- .tempt to close the circuit by means of an inserted bent wire, since the uncertainty as to the direction and degree of turnin which -would be required to et the first s ioulder level would make its a justment, even after considerable ex erimcnting, almost impossible. terminal clips 5 and (Badapted to contact one wing and the end of the key stem 7, it would, of course, be simply a matter of convenience and arrangement to make each of these contact a lateral Win The unauthorized insertion of a strange key can be further guarded against by inserting in the interior rounded surface of the cut-away And whi e I have shown the circuit port-ion of the body block in which the wings I swing, as the stem is to be turned about its axis, projections or especially formed trackways complementarily in cross section to the'correspondingly toothed edge of the Wing members of the original key. T hese tracked or projecting parts must begin and end short of the location of the initial drop of the wing on that shoulder through the radial cut-away portions of the body block, and through the part at the end of the curved swing of the wing from which it is to drop into the second radial cut-away portion, since otherwise the interengaging of these toothed portions would prevent the further sliding of the wings lengthwise of the block, that is, parallel to the stem of the key.

Vhat I claim is z-- 1. A circuit switch, having, in combination with a loi'igitudinally bored body portion, and laterally extending cuts therein extending radiallytherefroi'n, each of said cuts extending only a portion of the distance through the block and being placed at desired angles with respect to one another, a circuit terminal located adjacent the lower end of the longitudinal. bore, a second circuit terminal, located adjacent the outer endof one of said radial cuts, and a removable key member adapted to be inserted in said bored and, by turning of the same about its axis Where both of said circuit terminals are engaged by it, substantially as described.

2, In a switch, in combination with a body block having a central longitudinal bore and radial cut-away portions reaching therefrom in a variety of directions, circuit terminals located thereon adjacent to a plurality of diversely located points in the cutaway portion, and a removable key member provided with laterally projecting wing pieces com plementarily located on the stem thereof with respect to the cut-away portions of the body block, adapted to pass therethrough and to register With those por.- 'tions wherein the circuit terminals are l cated when the closure of the circuit is del sired, substantially as described.

\ In testimony whereof, I sign this specification in the presence of two witnesses.

LOYD WILSON.

Witnesses VIRGINIA C. VViLLIAM Vi.

SPRATT, q eWAN. 

